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        /* 标签选择器:通过标签名匹配元素; */
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    <h1>css演示</h1>
    <p style="color:lime;font-size: 32px;background-color: red";>今天也是元气满满的一天</p>
    <p></p>
    <h1>文档内嵌</h1>
    <h1>一级标题</h1>
    <h2>二级标题 外部引入css</h2>

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